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Mecer 5kva, setting Questions.


Swannie
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Hallo All,  I have installed a System with 6x 250watt panels, 2x3 in series and then parallel. My Inverter is a Mercer 5kva 5000 watt, runs on 16 x100ah LED Crystal batteries, 4 packs of 4. On my Inverter display it shows solar 850w and voltage 96+. It also runs on Solar and Batteries, the question is why not solar, and why it shows only 850w and not more, if my panels together are more? Dont know if my settings are correct, and can someone help me please. Thanks

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14 hours ago, Swannie said:

why it shows only 850w and not more, if my panels together are more?

There are many reasons why you won't get the rated power of the panels all the time. Panels heat up, reducing their voltage and hence their power; only near noon (usually) will they get full sun; often the tilt is fixed by the angle of the roof, and that doesn't match the position of the sun all year. Some panels get shaded, there are clouds and rain. Occasionally, you can get more than rated power for about 10 seconds, but it's rare.

Usually you can expect around 80% of name-plate power near noon, so about 1200 W in your case. You didn't say what time of day your 850 W reading was, and whether the inverter thought the battery was fully charged (middle green LED on solid).

You have lead acid batteries, so most of the default settings would be appropriate. What do you have currently for settings 01, 02, 05, 12, 13, 26, 27, and 29?

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5 hours ago, Swannie said:

12: 48V ; 13: 51V;

I would increase at least setting 12. It's more of an adjust to taste than something I can prescribe though.

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26: 54V ; 27: 53.2V;

Those are very low; 54 V (13.5 V per 12 V battery module) will take an eternity to charge. I'd check your battery manual or datasheet, but at least 56.4 V for setting 26 (bulk/absorb voltage), and I'd go to 54 V for setting 27 (float voltage).

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29: 42V

If you're going to use this setup regularly during load shedding, and this setting (the low DC cutoff voltage) is the only thing that stops the inverter running during load shedding, you should increase this to about 48.0 V. Note that when there is less than 2.0 V between settings 29 and 12, the effective value for setting 12 is setting 29 plus 2.0 V.

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9 minutes ago, Coulomb said:

I would increase at least setting 12. It's more of an adjust to taste than something I can prescribe though.

Those are very low; 54 V (13.5 V per 12 V battery module) will take an eternity to charge. I'd check your battery manual or datasheet, but at least 56.4 V for setting 26 (bulk/absorb voltage), and I'd go to 54 V for setting 27 (float voltage).

If you're going to use this setup regularly during load shedding, and this setting (the low DC cutoff voltage) is the only thing that stops the inverter running during load shedding, you should increase this to about 48.0 V. Note that when there is less than 2.0 V between settings 29 and 12, the effective value for setting 12 is setting 29 plus 2.0 V.

I also use Lead Crystal batteries . Setting 26 - 58v

                                                             Setting 27 - 55v

The charging specs on the batteries for my storing temperature .

Lead Crystal

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